DEMO
我看文档上是这样写的:
A percentage for the horizontal offset is relative to (width of background positioning area - width of background image). A percentage for the vertical offset is relative to (height of background positioning area - height of background image), where the size of the image is the size given by ‘background-size’.
那么为什么10%就会偏移那么多呢？
不解。
小伙看你根骨奇佳，潜力无限，来学PHP伐。